Today, Xinda Chemical Co., Ltd. will introduce the influence of ultra-fine silica on the properties of vulcanizates. I hope it will help you.


Ultrafine silica has a very significant reinforcing effect on all kinds of rubber, especially on silicone rubber. Ultrafine white carbon black is a kind of white reinforcing agent whose reinforcing effect is second only to that of corresponding furnace carbon black. Compared with the vulcanizates reinforced by the corresponding furnace carbon black (such as HAF), the vulcanizates containing a certain amount of ultra-fine white carbon black have the advantages of high strength, large elongation, high tear strength, high hardness and good insulation. Generally, carbon black and white carbon black can be used together to obtain better comprehensive properties.


The total amount of carbon black and white carbon black in the formula was kept constant, and the amount of white carbon black gradually increased. The vulcanization curve of rubber mixture was measured by 2000 rubber processing analyzer. Effect of the amount of silica on the vulcanization curve: it can be seen that with the increase of the amount of silica, the scorching time is prolonged, and the slope of the vulcanization curve in the hot vulcanization period is decreased, which indicates that the delay in the start of vulcanization, the slow speed of vulcanization, and the increase in the torque to reach the flat area are mainly due to the slightly acidic delayed vulcanization of silica caused by the siloxane and silanol groups on the surface of silica.


Plasticizing is then mixed with and on the open mill and the compounding agent is added. The vulcanization time 90 at 143 ℃ was measured by 2000 rubber processing analyzer, and the physical properties, wear properties and compression fatigue properties of the samples were measured after vulcanization on the flat plate vulcanizer at 90 ℃. Vulcanize the rubber at 90 ° C on the 2000 rubber processing analyzer, cool it to 50 ° C, and then program the temperature to 80 ° C. record the temperature at 60 ° C δ Value.


Please choose a regular company to buy white carbon black. Xinda Chemical has been engaged in the production and sales of white carbon black for many years and is worthy of your trust!